I have used RM clock to successfully undervolt the amd turion processor from 0.9v to 0.7 volts.

I know of and installed Rivatuner v2.09 but I do not know how to use it. Is there a way I can use it to reduce the power consumption. For example, I do not play any 3D games and I turned off the aero theme. Can I manipulate the graphics?

Nvidia PowerMizer is your only option. If it's not available in the Nvidia control panel, you may look at the HP website for the latest display drivers for your notebook. My brother's HP with 6150SE had the option already since I just did a clean XP install on there for him, as did my friend's Compaq once I installed the newest drivers. Another friend's HP with 6100 also had the option with the newest drivers.

For those with AMD RS690M (mobile version of 690G), these support PowerPlay, but again, with the latest drivers. Enabling it on my Acer Extensa 4420 gave me a 10% improvement in battery life. The maximum battery setting clocks the normally 400MHz IGP down to 130MHz, which is more than enough for my use on battery (light web browsing, instant messaging and lots of Word).

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